<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        div{
            width: 100px;
            height: 100px;
            background-color: red;
            border: 3px solid #ccc;
            border-radius: 20px;
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>
<script>
    const asd = document.querySelector('div')
    let offsetX = 
    function fn(e) {
        const X = 0;
        const Y = 0;

    }
    asd.addEventListener('mousemove')

</script>